WO2018211794A1

WO2018211794A1 - Condensate demineralization device

Info

Publication number: WO2018211794A1
Application number: PCT/JP2018/008990
Authority: WO
Inventors: 充余田
Original assignee: オルガノ株式会社
Priority date: 2017-05-19
Filing date: 2018-03-08
Publication date: 2018-11-22
Also published as: JP6910844B2; JP2018192442A

Abstract

The purpose of the invention is to easily separate a cation exchanger and an anion exchanger and control the installation area. A condensate demineralization device 1 has: an inner cylinder 3 defining an inner-side space 6 filled with a first ion exchanger; a container body 2 that encloses the inner cylinder 3, that defines, with the inner cylinder 3, an outer-side space 7 filled with at least a second ion exchanger, and that defines a connecting space 8 that communicates with the outer-side space 7; a condensate supply pipe 14 that supplies condensate to the inner-side space 6; and a condensate discharging unit 13 that is provided downstream of the second ion exchanger in the outer-side space 7 and that discharges the condensate having been treated with the second ion exchanger.

Description

Condensate demineralizer

This application is based on Japanese Patent Application No. 2017-99996, filed on May 19, 2017, and claims priority based on this application. This application is incorporated herein by reference in its entirety.

The present invention relates to the configuration of a condensate demineralizer.

At the power plant, a condensate demineralizer is used to demineralize the condensate. The demineralization tower of the condensate demineralizer is filled with a cation exchange resin and an anion exchange resin, and an anion component such as Na ⁺ and an anion component such as Cl ⁻ are removed. When the cation exchange resin or anion exchange resin reaches a saturated state, the cation exchange resin or anion exchange resin is transferred to the regeneration tower of the condensate demineralizer, regenerated with a chemical solution, and returned to the desalting tower again. Japanese Patent Application Laid-Open Nos. 2005-296748 and 2007-98328 disclose a condensate demineralization apparatus in which a cation exchange resin layer and an anion exchange resin layer are alternately stacked and separated by a separation wall. Yes. JP-A-8-82695 discloses a condensate demineralization apparatus in which a cation exchange resin tower filled with a cation exchange resin and an anion exchange resin tower filled with an anion exchange resin are connected in series. ing.

In the condensate demineralizer described in JP-A-2005-296748 and JP-A-2007-98328, the tower height becomes high because the cation exchange resin layer and the anion exchange resin layer are alternately laminated. . Also, in order to prevent reverse regeneration during resin regeneration, the cation exchange resin and anion exchange resin are extracted from the resin tower and regenerated separately, so that a separate regeneration tower, a line connecting the resin tower and the regeneration tower, etc. This will increase the cost of the condensate demineralizer and increase the installation area of the condensate demineralizer. In the condensate demineralizer described in JP-A-8-82695, the cation exchange resin is filled in the cation exchange resin tower and the anion exchange resin is filled in the anion exchange resin tower. The operation of separating is not necessary in principle. However, since it is necessary to install a cation exchange resin tower and an anion exchange resin tower, the cost of the condensate demineralizer increases, and the installation area of the condensate demineralizer increases.

An object of the present invention is to provide a condensate desalination apparatus in which the ion exchanger can be easily regenerated and the installation area is reduced.

The condensate demineralization apparatus of the present invention is an inner cylinder that forms an inner space filled with a first ion exchanger, and a container body that surrounds the inner cylinder, and is filled with at least a second ion exchanger. A container body that forms an outer space with the inner cylinder and forms a connection space that communicates with the outer space, a condensate supply pipe that supplies condensate to the inner space, and a second ion exchanger in the outer space And a condensate discharge unit for discharging the condensate treated with the second ion exchanger.

The condensate demineralization device of the present invention has a double cylindrical structure comprising an inner cylinder that forms an inner space and a container body that surrounds the inner cylinder and forms an outer space, and the first ion exchange is performed in the inner space. The body is filled with at least a second ion exchanger in the outer space. For this reason, an installation area can be reduced compared with the condensate demineralizer which charges a 1st ion exchanger and a 2nd ion exchanger to a separate tower. Moreover, since only the first ion exchanger is filled in the inner space, the first ion exchanger filled in the inner space does not require a separation operation.

Therefore, according to the present invention, it is possible to provide a condensate demineralization apparatus in which the ion exchanger can be easily regenerated and the installation area is reduced.

The above and other objects, features, and advantages of the present application will become apparent from the detailed description set forth below with reference to the accompanying drawings, which illustrate the present application.

It is a longitudinal cross-sectional view of the condensate demineralization apparatus which concerns on the 1st Embodiment of this invention. It is a cross-sectional view of the condensate demineralizer shown in FIG. 1A. It is a longitudinal cross-sectional view of the condensate demineralization apparatus which concerns on the 2nd Embodiment of this invention. It is a cross-sectional view of the condensate demineralizer shown in FIG. It is a cross-sectional view of the condensate demineralizer shown in FIG. It is a cross-sectional view of the condensate demineralizer shown in FIG. It is a schematic diagram which shows the flow of the condensate of the condensate demineralizer of 1st Embodiment and 2nd Embodiment. It is a schematic diagram which shows the flow of the condensate of the condensate demineralizer of 1st Embodiment and 2nd Embodiment. It is a cross-sectional view of the condensate demineralizer of the modification of 2nd Embodiment.

DESCRIPTION OF SYMBOLS 1,104 Condensate demineralizer 2 Container body 3 Inner cylinder 6 Inner space 7 Outer space 8 Connection space 13 Condensate discharge part 14 Condensate supply pipe 14a Condensate supply opening 15 Collecting part (collection pipe)
15a Condensate water collection opening 15b Condensate

outlet

16, 26 First chemical liquid supply pipe 16a Chemical liquid supply opening 19 Second chemical liquid supply pipe 21 Chemical liquid recovery port 22 Cation exchange resin extraction port 23 Anion exchange resin extraction port 28 Water supply port A Anion exchange resin single bed layer C Cation exchange resin single bed layer M Mixed bed layer

Hereinafter, condensate demineralization apparatuses according to some embodiments of the present invention will be described with reference to the drawings. The

condensate demineralizer

1, 101 of the present invention is mainly used in power plants. Steam that has worked in a turbine (not shown) is condensed in a condenser (not shown) to become condensate, filtered by a condensate filtration device (not shown), etc., and then a condensate demineralizer. Desalinated at 1,101 and supplied to a steam generator such as a boiler (not shown).

(First embodiment)
1A is a longitudinal sectional view of the condensate demineralizer 1 according to the first embodiment of the present invention, and FIG. 1B is a transverse sectional view taken along the line AA of FIG. 1A. The condensate demineralizer 1 includes a container main body 2 constituting a pressure vessel and an inner cylinder 3 provided inside the container main body 2. The container body 2 has a cylindrical side wall 2a having a center line 2d in the vertical direction Z, a dome-shaped top plate 2b connected to the upper portion of the side wall 2a, a dome-shaped bottom plate 2c connected to the lower portion of the side wall 2a, It is composed of The inner cylinder 3 has a cylindrical shape and is arranged concentrically with the container body 2. The inner cylinder 3 is welded to the bottom plate 2c of the container body 2, and the upper portion of the inner cylinder 3 is covered with an inner partition plate 4 in which a plurality of openings having a size capable of preventing the ion exchanger from flowing out are formed. Therefore, the inner cylinder 3 forms an inner space 6 together with the inner partition plate 4 and the bottom plate 2 c of the container body 2. An outer space 7 is formed between the inner cylinder 3 and the container main body 2 (side wall 2a). The upper part of the container body 2 is a connection space 8 that communicates with the outer space 7. Between the outer space 7 and the connection space 8, there is provided an outer partition plate 5 in which a plurality of openings having a size capable of preventing the outflow of the ion exchanger are formed, and the outer space 7 is interposed through the openings. The connection space 8 is communicated. The inner space 6 communicates with the connection space 8 through the opening of the inner partition plate 4. A manhole 9 is provided in the top plate 2b of the container body 2 and is used for maintenance purposes. A manhole 11 is also provided in the side wall 2 a of the container body 2. The inner surface of the container body 2 and the both surfaces of the inner cylinder 3 are lined because they are resin contact surfaces.

The inner space 6 is filled with the first ion exchanger, and the outer space 7 is filled with the second ion exchanger. Here, the first ion exchanger is a cation exchanger, preferably a cation exchange resin (hereinafter sometimes referred to as cation exchange resin layer C), and the second ion exchanger is an anion exchanger, preferably an anion exchange. It is a resin (hereinafter sometimes referred to as an anion exchange resin single bed layer A). The anion exchange resin is supported by an annular support plate 12 provided at an intermediate position in the vertical direction Z of the outer space 7. The support plate 12 has a large number of openings large enough to allow condensate to pass through but retain the anion exchange resin. Near the bottom plate 2c of the container body 2 below the support plate 12, a condensate discharge portion 13 for discharging condensate is provided. The condensate discharge part 13 is formed by a ring pipe 13 a having a large number of openings formed on the surface, and a through part 13 b connected to the ring pipe 13 a and penetrating the container body 2.

The downstream space or the lower portion of the anion exchange resin single bed layer A in the outer space 7 is filled with a mixed cation exchange resin and an anion exchange resin (hereinafter sometimes referred to as a mixed layer M). The condensate discharge unit 13 is embedded in the mixed layer M. Most of the ionic components in the condensate are removed by the cation exchange resin layer C and the anion exchange resin single bed layer A, and as will be described later, the cation exchange resin layer C and the anion exchange resin single bed layer A are washed after regeneration with a chemical solution. Therefore, the load of the residual chemical solution is also small. For this reason, the mixed layer M is provided for the purpose of finishing, and a small amount is sufficient and is periodically replaced without being regenerated. The mixed layer M can be omitted depending on the required water quality of the condensate.

The first ion exchanger may be an anion exchange resin, and the second ion exchanger may be a cation exchange resin or a mixture of an anion exchange resin and a cation exchange resin. That is, the inner space 6 can be filled with an anion exchange resin, and the support plate 12 in the outer space 7 can be filled with a cation exchange resin or a mixed layer of a cation exchange resin and an anion exchange resin. However, as in this embodiment, the cation exchange resin is filled into the inner space 6, the anion exchange resin is filled onto the support plate 12 in the outer space 7, and the condensate is used as the cation exchange resin layer C and the anion exchange resin single bed. It is more preferable to flow in the order of layer A. This is due to the following reason. Generally, in a thermal power plant or the like, the pH of condensate is adjusted to about 9.3 to 9.6 to prevent corrosion of system facilities. For this purpose, ammonia may be injected into the condensate. Since the cation exchange resin removes not only Na ions but also ammonia, a high load is applied. For this reason, the condensate demineralizer 1 is filled with more cation exchange resin than an anion exchange resin. In an example of the condition where the condensate flow rate is 730 m ³ / h, the cation exchange resin filling amount of the cation exchange resin single bed layer C is about 6 m ³ , and the anion exchange resin filling amount of the anion exchange resin single bed layer A is about 3 m. ^3. The total filling amount of the cation exchange resin and the anion exchange resin in the mixed bed layer M is about 1 m ³ . Therefore, when an appropriate bed height Ch is taken into account, when the cation exchange resin is installed in the outer space 7, the planar size of the condensate demineralizer 1 tends to increase. Further, when the outer space 7 is filled with the cation exchange resin, it may be difficult to move on the planar support plate 12 when extracting the cation exchange resin as described later. This is because the specific gravity of the cation exchange resin is larger than that of the anion exchange resin. On the other hand, when the inner space 6 is filled with the cation exchange resin, the inclination of the bottom surface of the container body 2 can be used, so that the cation exchange resin can be extracted more smoothly. Furthermore, it has been found that the water quality of the condensate is improved by flowing the condensate in the order of cation exchange resin and anion exchange resin. As described above, the present embodiment is configured such that the cation exchange resin is filled in the inner space 6 and the condensate flows in the order of the cation exchange resin single bed layer C and the anion exchange resin single bed layer A.

A ring-shaped first chemical supply pipe 26 for supplying a regenerated chemical solution of the cation exchange resin is provided above the cation exchange resin single bed layer C in the inner space 6. The first chemical liquid supply pipe 26 is connected to a pipe 27 that penetrates the container body 2 and the inner cylinder 3. A strongly acidic liquid such as HCl is preferably used as the regenerative chemical solution for the cation exchange resin. The regenerated chemical solution is extracted from a drain pipe (not shown) provided on the bottom plate 2c and collected. The drain pipe can also use the extraction port 22 and the condensate supply port 28.

Above the anion exchange resin single bed layer A in the outer space 7, a ring-shaped second chemical liquid supply pipe 19 for supplying a regenerated chemical liquid of the anion exchange resin is provided. The second chemical liquid supply pipe 19 is connected to a pipe 20 that penetrates the container body 2. Below the anion exchange resin single-bed layer A, more specifically, directly below the support plate 12, a chemical solution recovery port 21 that opens to the container body 2 and collects the regenerated chemical solution of the anion exchange resin is provided. A strong alkaline liquid such as NaOH is preferably used as the regenerative chemical solution for the anion exchange resin.

The extraction port 22 for extracting the cation exchange resin is provided below the cation exchange resin layer C of the container body 2. An extraction port 23 for extracting the anion exchange resin is provided below the anion exchange resin single bed layer A of the container body 2. Further, an extraction port 24 for extracting the cation exchange resin and the anion exchange resin of the mixed bed layer M is provided below the mixed bed layer M of the container body 2. The

extraction ports

22 and 24 are preferably provided as close to the center of the container body 2 as possible, and the extraction port 23 is preferably provided as close to the support plate 12 as possible. The bottom plate 2c of the container body 2 is provided with a condensate supply port 28 concentric with the center line 2d.

Condensate is processed in the condensate demineralizer 1 as follows (see also FIG. 4A). First, the condensate flowing into the inner space 6 from the condensate supply port 28 flows upward, passes through the cation exchange resin single floor layer C, and flows out from the opening of the inner partition plate 4 into the connection space 8. The condensate then flows through the opening of the outer partition plate 5 between the outer space 7 and the connection space 8 and flows downward into the outer space 7. The condensate is once held in the outer partition plate 5 and then supplied to the outer space 7 through a number of openings in the outer partition plate 5. For this reason, condensate is supplied uniformly in the circumferential direction and does not fall directly on the anion exchange resin, so that the anion exchange resin can be prevented from rising due to non-uniform flow and the anion exchange resin layer height can be kept constant. Can do. The condensate is supplied with an anion exchange resin single bed layer A from which an anion component is removed and supplied to the mixed bed layer M through the support plate 12. The cation component and the anion component contained in the condensate are further removed by the mixed bed layer M. The chemical solution that may remain during regeneration is also removed by the mixed bed layer M. The condensate thus treated with the cation exchange resin and the anion exchange resin is discharged from the condensate demineralizer 1 through the condensate discharge unit 13.

Next, a method for regenerating the cation exchange resin and the anion exchange resin in the condensate demineralizer 1 will be described.

First, the condensate demineralizer 1 is isolated from the condensate system of the power plant, the inside of the condensate demineralizer 1 is opened to the atmosphere, and the condensate is drained. As a result, the inner space 6 filled with the cation exchange resin is separated from the outer space 7 filled with the anion exchange resin, and condensate is prevented from flowing between the inner space 6 and the outer space 7. Next, the regenerated chemical solution of the cation exchange resin is supplied to the inner space 6 from the first chemical solution supply pipe 26 connected in advance to a chemical solution tank (not shown) to regenerate the cation exchange resin. The regenerated chemical solution is collected from a drain pipe (not shown) branched from the condensate supply port 28. Since the first chemical liquid supply pipe 26 is a ring pipe, the chemical liquid is evenly supplied to the cation exchange resin. After the regeneration of the cation exchange resin, the connection destination of the first chemical solution supply pipe 26 is switched to the wash water tank, and the wash water is supplied from the first chemical solution supply pipe 26 to the inner space 6. The wash water is collected from a drain pipe (not shown) branched from the condensate supply port 28. The cation exchange resin is washed with washing water to remove the regenerative chemical solution and impurities attached to the surface. Pure water can be used as the washing water.

The anion exchange resin can be regenerated in the same manner. The second chemical liquid supply pipe 19 is connected in advance to a chemical tank (not shown). Next, an anion exchange resin regenerative chemical solution is supplied from the second chemical solution supply pipe 19 to the outer space 7 to regenerate the anion exchange resin. The regenerated chemical solution is collected from the chemical solution collection port 21. Since the second chemical liquid supply pipe 19 is a ring pipe, the chemical liquid is evenly supplied to the anion exchange resin. After the regeneration of the anion exchange resin, the connection destination of the second chemical liquid supply pipe 19 is switched to the washing water tank, and the cleaning water is supplied from the second chemical liquid supply pipe 19 to the outer space 7. The washing water is collected from the chemical solution collection port 21. The anion exchange resin is washed with washing water to remove the regenerated chemical solution and impurities attached to the surface. Pure water can be used as the washing water. The regeneration and washing of the anion exchange resin can be performed in parallel with the regeneration and washing of the cation exchange resin, but may be performed sequentially.

When the anion exchange resin is regenerated and washed, the condensate discharge unit 13 can be connected to a water source, and water can be supplied from the condensate discharge unit 13 toward the chemical liquid recovery port 21. At this time, it is desirable to adjust the flow rate so that the water level is approximately the same as that of the chemical solution recovery port 21. The chemical solution and water are simultaneously discharged from the chemical solution recovery port 21. The water supplied from the condensate discharge unit 13 prevents the chemical solution from flowing into the mixed bed layer M below the anion exchange resin single bed layer A. When a chemical solution (such as NaOH) of an anion exchange resin flows into the mixed bed layer M, the cation exchange resin in the mixed bed layer M causes reverse regeneration. When the cation exchange resin is reversely regenerated, it becomes Na form, and Na ions are released during desalting, causing corrosion, scale, and the like.

Next, a method for extracting the cation exchange resin and the anion exchange resin from the condensate demineralizer 1 will be described. Since the cation exchange resin in the inner space 6 and the anion exchange resin in the outer space 7 are regenerated by the above-described method, they are usually not extracted from the condensate demineralizer 1, but are extracted when the resin reaches the end of its life. It is possible.

When draining the cation exchange resin from the inner space 6, first drain the water in the tower. Next, water is supplied from the condensate supply port 28 to loosen the cation exchange resin layer, and air is supplied from the air supply means (not shown) connected to the first chemical solution supply pipe 26 through the first chemical solution supply pipe 26. Supply and pressurize the inside of the tower. And the valve (not shown) provided in the extraction port 22 is opened, and cation exchange resin is extracted. Since the bottom plate 2c of the container body 2 is inclined downward toward the center, the cation exchange resin moves toward the center of the bottom plate 2c together with the pressure of air and is pushed out (discharged) from the extraction port 22. .

When draining the anion exchange resin in the outer space 7, first drain the water in the tower. Next, water is supplied from the condensate discharge unit 13 to loosen the anion exchange resin layer, and air is supplied from the air supply means (not shown) connected to the second chemical solution supply pipe 19 through the second chemical solution supply pipe 19. Supply and pressurize the inside of the tower. And the valve (not shown) provided in the extraction port 23 is opened, and anion exchange resin is extracted. Although the support plate 12 is horizontal, since the anion exchange resin is lighter than the cation exchange resin, the anion exchange resin can be moved only by the pressure of air. In this way, the anion exchange resin is pushed out (discharged) from the extraction port 23.

When extracting the mixed bed layer M of the cation exchange resin and the anion exchange resin, the water in the tower is drained first. Next, water is supplied from the condensate discharge unit 13 to loosen the mixed bed layer M, and air is supplied from an air supply means (not shown) connected to the condensate discharge unit 13 through the condensate discharge unit 13. Pressurize the inside. And the valve (not shown) provided in the extraction port 24 is opened, and mixed bed resin is extracted. Since the bottom plate 2c of the container body 2 is inclined downward toward the center, the mixed bed layer M moves toward the center of the bottom plate 2c in combination with the pressure of air, and is pushed out (discharged) from the extraction port 24. ).

The condensate demineralization apparatus 1 according to this embodiment includes an inner space 6 provided with a cation exchange resin single bed layer C and an outer space provided with an anion exchange resin single bed layer A by a container body 2 and an inner cylinder 3. It is divided into seven. For this reason, an anion exchange resin and a cation exchange resin can be filled in one desalting tower, and the installation area of the condensate demineralizer 1 can be reduced. Since the cation exchange resin single bed layer C and the anion exchange resin single bed layer A are disposed adjacent to each other in the lateral direction, the total height of the condensate demineralizer 1 can be suppressed.

The condensate demineralization apparatus 1 of this embodiment further has various advantages due to the ability to regenerate the cation exchange resin and the anion exchange resin internally. First, a regeneration tower for regenerating the cation exchange resin and the anion exchange resin is unnecessary. Conventionally, tower tanks such as two regeneration towers provided for regenerating each of the cation exchange resin and the anion exchange resin, and equipment such as a resin transfer pipe and a transfer pump associated therewith are not required. Therefore, the installation area of the facility is reduced, and the cost of the building can be reduced when installed indoors.

In this embodiment, operations such as resin separation, transfer, and refilling into the condensate demineralizer 1 are not required, so that the time required for regeneration is also shortened. The conventional condensate demineralizer regenerates the resin in parallel in two regeneration towers, but the condensate demineralizer 1 of this embodiment also regenerates the cation exchange resin and the anion exchange resin in parallel. Therefore, there is no significant difference in the time required for resin regeneration itself. Furthermore, since the water required for the separation and transfer of the resin becomes unnecessary, the amount of water used and the amount of waste liquid are also reduced.

(Second Embodiment)
2 is a longitudinal sectional view of the condensate demineralizer 101 according to the second embodiment of the present invention, FIG. 3A is a transverse sectional view taken along the line AA of FIG. 2, and FIG. 3B is a sectional view of FIG. FIG. 3C shows a cross-sectional view taken along line B, and FIG. 3C shows a cross-sectional view taken along line CC in FIG. FIG. 2 is a longitudinal sectional view taken along the line DD in FIGS. 3A to 3C. Hereinafter, the same points as those in the first embodiment will be omitted, and differences from the first embodiment will be mainly described.

In the inner space 6, a condensate supply pipe 14 extending in the vertical direction Z is provided. The condensate supply pipe 14 is provided substantially at the center of the inner space 6, that is, coaxially with the inner space 6 or the center line 2 d of the container body 2. The condensate supply pipe 14 passes through the bottom plate 2 c of the container main body 2, and the condensate is supplied to the condensate demineralizer 1 by an upward flow from below the condensate demineralizer 1. A plurality of condensate supply openings 14a are formed in the side wall 14b of the condensate supply pipe 14 so that the ion exchanger does not pass through. The condensate supply openings 14 a are provided substantially evenly in the circumferential direction of the condensate supply pipe 14, and are provided at substantially the same pitch in the vertical direction Z. The size of the condensate supply opening 14a increases toward the upper part of the condensate supply pipe 14 so that the condensate is supplied at almost the same flow rate from any position in the vertical direction Z of the condensate supply pipe 14. It may be. Instead of changing the size of the condensate supply opening 14 a in the vertical direction Z, the arrangement pitch in the vertical direction Z of the condensate supply opening 14 a may be reduced toward the upper part of the condensate supply pipe 14.

Manholes

9 and 11 are respectively provided in the top plate 2b and the inner partition plate 4 of the container body 2, and are used for the purpose of installing and maintaining a condensate supply pipe 14 to be described later. The cation exchange resin is filled from the bottom surface of the inner space 6, that is, from the bottom surface of the container body 2 to just below the inner partition plate 4. For this reason, the cation exchange resin is filled at a high filling rate. Unlike the first embodiment, the inner partition plate 4 is not provided with an opening through which condensate flows.

A water collecting portion extending in the vertical direction Z is formed facing the condensate supply pipe 14. The water collecting portion is disposed in the circumferential direction along the inner wall surface of the inner cylinder 3. In the present embodiment, the water collecting section is composed of eight water collecting pipes 15 arranged at an equal pitch in the circumferential direction along the inner wall surface of the inner cylinder 3, but the number of the water collecting pipes 15 is not limited to this. Each water collecting pipe 15 faces the condensate supply pipe 14 with the cation exchange resin interposed therebetween. Each water collecting pipe 15 has a plurality of condensate water collecting openings 15 a which are provided on the side wall 15 c and do not allow the ion exchanger to pass therethrough, and a condensate outlet 15 b which communicates with the connection space 8. The plurality of condensate water collection openings 15a have the same diameter and are arranged at equal pitches in the vertical direction Z at positions facing the wall surface of the inner cylinder 3 of the container body 2 so that the cation exchange resin can be used effectively. Is preferred. The water collection pipe 15 collects the condensate treated with the cation exchange resin from the condensate water collection opening 15a, and causes the condensate to flow out to the connection space 8 from the condensate outlet 15b.

In the inner space 6 of the condensate demineralizer 101, a plurality of first chemical solution supply pipes 16 for supplying a regenerated chemical solution of the cation exchange resin are provided. The plurality of first chemical solution supply pipes 16 are provided at equal intervals along the inner wall surface of the inner cylinder 3 and are alternately provided with the water collection pipes 15. Each first chemical solution supply pipe 16 faces the water collection pipe 15 with the cation exchange resin interposed therebetween. In the present embodiment, eight first chemical liquid supply pipes 16 are arranged at equal intervals, and the first chemical liquid supply pipes 16 and the water collecting pipes 15 are also arranged at equal intervals. The number of the first chemical liquid supply pipes 16 and the positional relationship with the water collecting pipe 15 are not limited to this. The side wall 16b of the first chemical solution supply pipe 16 is provided with a plurality of chemical solution supply openings 16a having a size that does not allow the ion exchanger that supplies the regenerated chemical solution to pass therethrough. The plurality of chemical solution supply openings 16 a are preferably arranged at equal pitches in the vertical direction Z at positions facing the wall surface of the inner cylinder 3 of the container body 2. The plurality of first chemical liquid supply pipes 16 are branched from a ring-shaped header pipe 17 provided in the connection space 8, and the header pipe 17 is connected to a pipe 18 that penetrates the top plate 2 b of the container body 2. A strongly acidic liquid such as HCl is preferably used as the regenerative chemical solution for the cation exchange resin.

Condensate is processed in the condensate demineralizer 101 as follows (see also FIG. 4B). First, the condensate that has flowed into the condensate supply pipe 14 circulates in the condensate supply pipe 14 in an upward flow. 6 is discharged. Condensate flows through the cation exchange resin layer C toward each water collecting pipe 15. For this reason, the condensate flows radially from the condensate supply pipe 14 toward each of the water collecting pipes 15 (radially outward) and in a generally horizontal direction. Since a plurality of the water collecting pipes 15 are provided along the inner wall surface of the inner cylinder 3, the condensate flows almost evenly in any angular direction around the center line 2 d of the container body 2. In this manner, the cation component is removed from the condensate by the cation exchange resin layer C.

The condensate is introduced into the collecting pipe 15 from the condensate collecting opening 15a of the collecting pipe 15, and becomes an upward flow again and flows out from the condensate outlet 15b to the connection space 8. Thereafter, in the condensate, the anion component is removed by the anion exchange resin single bed layer A in the same manner as in the first embodiment, and the cation component and the anion component are further removed by the mixed bed layer M. Condensate is discharged from the condensate demineralizer 1 through the condensate discharge unit 13.

Thus, in this embodiment, the condensate circulates in the inner space 6 in the radial direction. As a result, the height of the cation exchange resin layer C is defined not in the vertical direction Z but in the horizontal direction. 4A shows a schematic cross-sectional view of the condensate demineralizer 1 of the first embodiment, and FIG. 4B shows a schematic cross-sectional view of the condensate demineralizer 101 of the second embodiment. . FIG. 4A exaggerates the diameter for convenience of explanation. It is assumed that the volume of the cation exchange resin layer C is the same. In the figure, the thick line indicates the flow of condensate. In the condensate demineralization apparatus 101 of the second embodiment, the layer height Ch of the cation exchange resin layer C is defined in the radial direction or horizontal direction of the container body 2. The bed height Ch is required to be constant for ensuring the water quality of the condensate, and it is necessary to set it to an appropriate range in order to prevent excessive pressure loss. In the condensate demineralization apparatus 1 of the first embodiment, the cation exchange resin layer C and the anion exchange resin single bed layer A are partitioned by the inner cylinder 3 as in the second embodiment. However, since condensate flows upward from the bottom of the cation exchange resin layer C as in the prior art, the layer height Ch of the cation exchange resin layer C is defined in the vertical direction Z. As a result, the condensate demineralization apparatus 1 of the first embodiment tends to generate a space above the cation exchange resin layer C that is not filled with the cation exchange resin. On the other hand, since the cation exchange resin is efficiently filled in the second embodiment, the space utilization rate is high. Therefore, the condensate demineralizer 101 can be made compact, and the cost can be further suppressed as compared with the condensate demineralizer 1 of the first embodiment. Moreover, in the second embodiment, the planar size of the condensate demineralizer 1 is also suppressed. Thereby, the installation area of the condensate demineralizer 101 can be reduced, and the cost of the building where the condensate demineralizer 101 is installed can also be suppressed. In the case of the first embodiment, if the device is made compact, the cation exchange resin layer C becomes a layer height, so that the differential pressure increases. In the case of the second embodiment, the device is made compact. In addition, the differential pressure can be reduced.

Next, a method for regenerating the cation exchange resin and the anion exchange resin in the above-described condensate demineralizer 101 will be described.

First, the condensate demineralizer 101 is isolated from the condensate system of the power plant, the interior of the condensate demineralizer 1 is opened to the atmosphere, and the condensate is drained. As a result, the inner space 6 filled with the cation exchange resin is separated from the outer space 7 filled with the anion exchange resin, and condensate is prevented from flowing between the inner space 6 and the outer space 7. The first chemical supply pipe 16 is connected to a chemical tank (not shown), and the condensate supply pipe 14 is connected to a drain pipe (not shown).

Next, the regenerated chemical solution of the cation exchange resin is supplied from the first chemical solution supply pipe 16 to the inner space 6, and the regenerated chemical solution is recovered by the condensate supply pipe 14 to regenerate the cation exchange resin. In the present embodiment, the regenerative chemical solution flows in the opposite direction to the condensate flow, that is, substantially horizontally toward the radially inner side of the container body 2 (countercurrent regeneration). In the countercurrent regeneration, since the condensate flow is regenerated from the resin on the most downstream side (exit side) of the cation exchange resin layer C, stable water quality can be maintained.

After regeneration of the cation exchange resin, the connection destination of the first chemical liquid supply pipe 16 is switched to a cleaning water tank (not shown), and the cleaning water is supplied from the first chemical liquid supply pipe 16 to the inner space 6. By collecting the wash water with the condensate supply pipe 14, the wash water flows in the direction opposite to the direction of the condensate. The cation exchange resin is washed with washing water to remove the regenerative chemical solution and impurities attached to the surface. Pure water can be used as the washing water. Since the washing water is also supplied from the most downstream side (exit side) of the cation exchange resin single bed layer C with respect to the condensate flow, the residual chemical solution flows to the anion exchange resin in the subsequent stage, and the anion exchange resin is reversely regenerated. This can be prevented. When the anion exchange resin is reversely regenerated, it becomes Cl type (SO ₄ type when sulfuric acid is used as a regenerative chemical solution), and chlorine ions and sulfate ions are released during desalting, which causes corrosion, scale, and the like. The anion exchange resin can be regenerated in the same manner as in the first embodiment.

When draining the cation exchange resin from the inner space 6, first drain the water in the tower. Next, water is supplied from the condensate supply pipe 14 to loosen the cation exchange resin layer, and air is supplied from the air supply means (not shown) connected to the first chemical liquid supply pipe 16 through the first chemical liquid supply pipe 16. Supply and pressurize the inside of the tower. And the valve (not shown) provided in the extraction port 22 is opened, and cation exchange resin is extracted. Since the bottom plate 2c of the container body 2 is inclined downward toward the center, the cation exchange resin moves toward the center of the bottom plate 2c together with the pressure of air and is pushed out (discharged) from the extraction port 22. . The anion exchange resin in the outer space 7 can be extracted in the same manner as in the first embodiment.

The second embodiment of the present invention is not limited to this, and various modifications are possible.

First, conversely to the above embodiment, the condensate can be flowed radially inward of the condensate demineralizer 101, and the chemical solution and washing water can be flowed radially outward.

The connection space 8 may be provided in the lower part of the container body 2. Although illustration is omitted, the condensate is supplied to the condensate demineralizer 101 from above the condensate demineralizer 101 and is radially outward from the condensate supply pipe 14 toward the water collecting portion 15 as in the above embodiment. The cation component is removed by the cation exchange resin single bed layer C. The condensate flows downward in the water collecting portion 15 and flows into the connection space 8, and further flows upward through the anion exchange resin single bed layer A and mixed bed layer M in the outer space 7, and the upper part of the container body 2. Discharged from.

The water collecting section is composed of a plurality of water collecting pipes 15, but the water collecting section can take various configurations as long as the condensate flows in the radial direction inside the cation exchange resin. FIG. 5 is a cross-sectional view similar to FIG. 3C, taken along line CC in FIG. In this example, a second inner cylinder 25 concentric with the inner cylinder 3 is provided inside the inner cylinder 3, and a flow path having an annular cross section is formed between the inner cylinder 3 and the second inner cylinder 25. Yes. A number of condensate water collection openings (not shown) are formed in the second inner cylinder 25.

Although several preferred embodiments of the present invention have been shown and described in detail, it should be understood that various changes and modifications can be made without departing from the spirit or scope of the appended claims.

Claims

An inner cylinder forming an inner space filled with the first ion exchanger;
A container body surrounding the inner cylinder, the container body forming an outer space filled with at least a second ion exchanger between the inner cylinder and a connection space communicating with the outer space; ,
A condensate supply unit for supplying condensate to the inner space;
A condensate demineralizer having a condensate discharge unit that is provided downstream of the second ion exchanger in the outer space and discharges the condensate treated with the second ion exchanger.
The condensate supply section is a condensate supply pipe that extends in the vertical direction in the inner space and has a plurality of condensate supply openings formed on a side wall thereof.
The inner space further includes a water collection portion extending in a vertical direction facing the condensate supply pipe across the first ion exchanger, and the water collection portion has a first ion exchange on a side wall. The condensate demineralizer according to claim 1, wherein a condensate water collection opening for collecting condensate treated by a body is formed, and a condensate outlet is provided in communication with the connection space.
The condensate demineralizer according to claim 2, wherein the condensate supply pipe is located substantially at the center of the inner space, and the water collecting portion is disposed in a circumferential direction along the inner wall surface of the inner cylinder.
The condensate demineralization according to claim 3, wherein the water collecting section is a plurality of water collecting pipes, and each water collecting pipe has a plurality of condensate water collecting openings provided in a side wall and the condensate outlet. apparatus.
5. The apparatus according to claim 1, further comprising a first chemical solution supply pipe that extends in the vertical direction in the inner space and has a plurality of chemical solution supply openings that supply a regenerative chemical solution of the first ion exchanger on the side wall. The condensate demineralizer according to item 1.
The container main body opens below the filling portion of the first ion exchanger, is connected to an extraction port for extracting the first ion exchanger, and the first chemical supply pipe, and 6. The condensate demineralizer according to claim 5, further comprising air supply means for supplying air for pressurizing the inner space through the first chemical supply pipe when the ion exchanger is extracted.
A second chemical solution supply pipe for supplying a regenerative chemical solution for the second ion exchanger located above the filling portion of the second ion exchanger in the outer space; and the second ions of the container body. The condensate demineralizer according to any one of claims 1 to 6, further comprising: a chemical solution recovery port that opens below a filling portion of the exchanger and collects the regenerated chemical solution of the second ion exchanger. .
A cation exchanger and an anion exchanger are packed in a mixed bed downstream of the filling section of the second ion exchanger in the outer space,
The condensate demineralizer according to claim 7, further comprising water supply means for supplying water toward the chemical solution recovery port during regeneration of the second ion exchanger.
Opened below the filling portion of the anion exchanger of the container main body, connected to an extraction port for extracting the anion exchanger and the second chemical liquid supply pipe, and the outer space when extracting the anion exchanger The condensate demineralizer according to claim 7 or 8, further comprising an air supply means for supplying air for pressurizing the water.
The condensate demineralizer according to any one of claims 1 to 9, wherein the first ion exchanger is a cation exchange resin and the second ion exchanger is an anion exchange resin.